Search a number
-
+
7901221 = 59133919
BaseRepresentation
bin11110001001000000100101
3112212102102211
4132021000211
54010314341
6441203421
7124105426
oct36110045
915772384
107901221
114507339
122790571
1318384a3
14109964d
15a61181
hex789025

7901221 has 4 divisors (see below), whose sum is σ = 8035200. Its totient is φ = 7767244.

The previous prime is 7901203. The next prime is 7901251. The reversal of 7901221 is 1221097.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7901221 - 29 = 7900709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7901192 and 7901201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7901251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66901 + ... + 67018.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 27901221 is an apocalyptic number.

It is an amenable number.

7901221 is a deficient number, since it is larger than the sum of its proper divisors (133979).

7901221 is a wasteful number, since it uses less digits than its factorization.

7901221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133978.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 7901221 is about 2810.9110622714. The cubic root of 7901221 is about 199.1734302853.

The spelling of 7901221 in words is "seven million, nine hundred one thousand, two hundred twenty-one".

Divisors: 1 59 133919 7901221